Yes, I've tried to scientifically determine why my butt aches, but after about 5 mins I'm too lost in the joys of biking (a bit like Homer going "ooo, shiny") and it's only when the discomfort works it's way into my consciousness that it becomes a problem. But moving forwards to the tank (feels awkward changing gear)/backwards onto the passenger seat (too much of a stretch) does temporarily alleviate the pain. Either that or tuck in, wind it on and just concentrate on the road ahead.
Mind you I can get achey-bum syndrome on just about any chair it seems. Wonder if having popped a disc a few years back is a behind this?
When I was learning we had CB650s and Z650s, the Z650, the main bike used, gave me bum ache after about 20 mins, the CB650, used only once but for about an hour, gave no pain at all - mind you that was the first big bike I had ever ridden on the public highway, it was dark and the morning rush hour so my physical condition was not uppermost in my mind at the time.
Looking at cycle-ergo, the forward lean is the same for CB1100 and Z650 but less for the CB650, indeed when I shuffle right up to the tank, the position feels like what I remember it to have been on the CB650.
Makes me wonder if a 2" pull back, or buckhorns, would help?
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